I have made it. It creates sound. But i have a problem. I am Windows, loopMIDI, Hairless and addictivve drum. But when i hit the piezo it plays two instrument on the addictive drum. Like when I tap my first piezo, it plays the snare and the Hanging toms together. What to do???I also tried this on EZDrums, the same problem occurs.

Great project. But when i try to verify the code for hairless it says "serial was not declared in the scope". What to do?And with harless should I have to use the GarageBand software?Colde you please help me to use this prototype on windows properly, please.